Home / 1,638.12-2,260.62-939.48

Finding the Fourth Proportional to 1,638.12, 2,260.62 and 939.48

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Solution

The fourth proportional to 1,638.12, 2,260.62 and 939.48 is: 1,296.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.12 : 2,260.62 = 939.48 : x
  2. Step 2: Convert to fraction form
    1,638.12/2,260.62 = 939.48/x
  3. Step 3: Cross multiply
    1,638.12x = 2,260.62 × 939.48
  4. Step 4: Simplify right side
    1,638.12x = 2,123,807.28
  5. Step 5: Solve for x
    x = 2,123,807.28/1,638.12
  6. Step 6: Final answer
    x = 1,296.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.